Abstract

The invention relates to a method in manufacturing a product based on thermoplastic, wherein a composite structured product to be manufactured from thermoplastic based material is being put together by a compression molding process from composite material substance comprising natural fiber by using a mold arrangement (2), by means of which composite material substance, being fed thereto, is being heated (II) at a melting temperature of the thermoplastic and, by means of which the product (1') to be produced is being cooled (III) after pressing (P) thereof into form. In the processing a composite material (1") is being used, which contains non-cold-formable natural fiber substance and in which plastic substance and possible additives are inside a chemically bound 3D-web formed of the natural fiber substance, whereby formability of the said 3D-web for performing the compression molding is being achieved by preheating the plastic substance in the natural fiber substance inside the 3D-web prior to performing the compression molding. The invention also relates to an apparatus and use related to the utilization of the method.

IPC Classes  ?

• B29C 43/52 - Heating or cooling
• B29B 13/02 - Conditioning or physical treatment of the material to be shaped by heating
• B29C 51/42 - Heating or cooling
• B29C 70/40 - Shaping or impregnating by compression
• C08J 5/04 - Reinforcing macromolecular compounds with loose or coherent fibrous material

Abstract

The invention relates to a method for manufacturing a composite material comprising natural fibres such as lignocellulosic fibres, a thermoplastic material and a compatibilizing compound. The composite material is being manufactured by mixing (M) the substances with each other, and thereafter by mechanically pressing and/or by drying with heat the formed mixture in order to remove water. A wet mixture with 41 -99,8 % water is being formed, whereafter in order to manufacture a composite material having an internal network structure that keeps material together by chemical bonds between the thermoplastic substance and the natural fibre substance, the wet mixture is being fed to a devolatilization process (D), in which water and other volatile substances are being removed by pressure change, heat and mechanical mixing, whereby the structure of the lignocellulosic fibres is optionally modified.

IPC Classes  ?

• B27N 1/02 - Mixing the material with binding agent
• B29B 7/42 - MixingKneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
• C08J 3/215 - Compounding polymers with additives, e.g. colouring in the presence of a liquid phase the polymer being premixed with a liquid phase at least one additive being also premixed with a liquid phase
• C08L 97/02 - Lignocellulosic material, e.g. wood, straw or bagasse

Abstract

A web-type composite intermediate is formed from fibers and plastic. The composite intermediate is formed by wet web formation from a substantially homogeneous liquid mixture which contains natural fibers, plastic particles having a diameter of less than approximately 1000 μm, and an agent that improves compatibility between natural fibers and plastic particles. In addition, a method for forming a composite intermediate and the use of the composite intermediate are also described.

IPC Classes  ?

• D21H 17/34 - Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• D21H 21/50 - Non-fibrous material added to the pulp, characterised by its function, form or propertiesPaper impregnating or coating material, characterised by its function, form or properties characterised by form
• D21H 25/04 - Physical treatment, e.g. heating or irradiating

Abstract

The invention relates to a web-type composite intermediate which is formed from fibers and plastic. According to the invention, the composite intermediate is formed by wet web formation from a substantially homogeneous liquid mixture which contains natural fibers, plastic particles having a diameter of less than approximately 1000μm, and an agent that improves compatibility between natural fibers and plastic particles. In addition, the invention relates to a method for forming a composite intermediate and to the use of the composite intermediate.

IPC Classes  ?

• D21H 17/20 - Macromolecular organic compounds
• D21H 17/28 - Starch
• D21H 17/33 - Synthetic macromolecular compounds
• D21H 17/34 - Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• D21H 17/35 - Polyalkenes, e.g. polystyrene
• D21H 17/36 - PolyalkenylalcoholsPolyalkenylethersPolyalkenylesters
• D21H 17/37 - Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
• D21H 17/45 - Nitrogen-containing groups
• D21H 17/47 - Condensation polymers of aldehydes or ketones
• D21H 17/53 - PolyethersPolyesters
• D21H 21/14 - Non-fibrous material added to the pulp, characterised by its function, form or propertiesPaper impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
• D21H 21/18 - Reinforcing agents
• D21H 21/52 - Additives of definite length or shape
• D21H 17/03 - Non-macromolecular organic compounds
• D21H 17/15 - Polycarboxylic acids, e.g. maleic acid